Pump jack



Jan. 12 1926.

F. GARDNER PUMP JACK Filed 0G12. 9, 1924 2 Sheets-Sheet 1 @Hoz may* Jan.12 1926. 1,569,318.

F, GARDNER PUMP JACK Filed oct. 9, 1924 2 sheets-sheet 2 zZ f/ 0j'Ffa/1L* @ordner i PatentedJan. 12, 19'26.

- UNITED xSTATES FRANK GARDNER, OF DALLAS, TEXAS.'

1 runt? JACK.

- Application ated october s, 1924. serial No. 742,558.

To all whom it may concern.' Y

Be it known that I, FRANK GARDNER, a

, citizen of the United States of America, re-

siding .at Dallas, in the county of Dallas and State of Texas, haveinvented certain new andl useful Improvements Vin Pump l Jacks, of whichthe'following is a specificabend or distort the same is obviated.

A further object is to produce a long stroke with a short beam.

Another object is to provide a simple, durable and eicient jack capableof heavy duty and long life.

A construction designed to carry out the invention will be hereinafterdescribed together with other features of the invention.

The invention will be more readily understood from a reading of thefollowing specifica-tion and by reference to the accompanying drawings,in which an example of the invention is shown, and wherein:

Fig. 1 is an elevation of a pump jack constructed in accordance with myinvention,

Fig. 2 is a plan view of the same,

Fig. 3 is a front elevation of the jack detached from the well,

Fig. 4 is an enlarged sectional view on the line 4 4 of Fig. 1,

Fig. 5 is an enlarged sectional view on the line 5 5 of Fig. 1,

Fig. 6 is an enlarged sectional view on the line 6--6 of Fig. 1,

Fig. 7 is an enlarged sec-tional view taken on the line 7 7 of Fig. 1and Fig. 8 is an enlarged sectional view on the lino 8 8 of Fig. 1.

In the drawings the numeral 10 designates a base formed of a pair ofI-beams. At the rear end of the base is pivotcd a Samson post 11composed of a pair of channel members having their open sides facing, asis shown in Fig` 6. A tenon block 12 is bolted between the lower ends ofthe channel members of the post and has a' depending central tenon orear, 13. A bearing bolt 14 passes through the base and the tenon, thelatter being spaced from the beams of the base by blocks 15. The blockand post are spaced above the base to clear the latter when swlnging.

A knuckle joint is formed at the upper end of the post b a bearing block16 bolted in the post and aving upstanding ears 17 receiving a tenon 18depending from a block 19 as is best shown in Fig. 5. The tenon ispivoted between the ears on a bolt 20. The

block 19 is bolted between the rear ends of channel members formin ahorizontal beam 21. At the front end o the beam hangers 22 spaced apartby a plate 23 are bolted to the inner faces of the channels. The hangershave hooks 24 depending below the beam and directed forwardly for thegudgeon A of the polish rod, B. The forward end of the base is fastenedto the well casing by a clamp 25.

One of the important features of the invention is a toggle joint andpitman whereby the beam is swung. A lower link 26 has an ear 27pivotedvon a bolt 28 between cheek blocks 29 mounted on the inner sideof the base beams as is shown best in Fig. 8. An upper link 30, has aneye journaled on a pin 31 Fig. 5) confined in a slotted bearing block 32secured within and between the channels of the post 11, just below theblock 16. An upright pitman 33 has an ear 34 at its lower end. This earis received in the fork 35 formed on the lower end of the pitman 30(Fig. 7) and this fork is disposed in a yoke 36 on the upper end of thelink 26. The yoke is mounted in a shackle 37 of a link 38. A king bolt39 passing through the ports 34, 35, 36 and 37 forms a pivot andconstitute the knuckle of a toggle joint.

The link 38 is connected to the pull-rod of the pumping power. When thebeam 21 is in/a horizontal position as is shown'in full lines in Fig. 1,the links 26 and 30 are alined and inclined from the base to the post,forming a. support and a brace for the latter. At its upper end thepitman has a cap 40 having a transverse fulcrum boss 41 engaging in thestep of a bearing block 42 (Fig. 4) bolted to the underside of the beam.

ln operating the jack the toggle joint is broken by the downwardpressure of the pitman 33 on the king bolt 39, due to the load liftingthe beam 21.

on the polish rod B. When the link 38 is moved to the right (Fig. 1) onthe slack stroke of the connecting rod, the pitman. is free to act. Whenthe toggle joint is broken the links 26 and 30 are swung downwardly andthe Samson post 11 is pulled forwardly, whereby the beam 21 and pitmanare tilted forwardly as is shown in dotted lines in Fig. 1. The forwardor tilting movement of the beam is suiicient to compensate for its swingas the polish rod moves downward, thus keeping the gudgeon A in linewith they rod and seated in the hooks 24. Y

This operation produces av long stroke lowing to the toggle joint andthe tilting post and the fulcrum on the pitman. Also the travel of thepolish rod is followed by the hooks 24 and the end of the beam. Upon thepull stroke the link 38 is moved tov restore the links 26 and 30 duringwhich movement the pitman 33 is elevated, thus By reason of the togglejoint a comparatively short beam' and base" may be used and a compactand substantial jack is thus produced. The parts may of course beconstructed in accordance with the field practice and various changes inthe size and shape and arrangement may be made within the scope of theappended claims.

What'I claim, is:

. 1. In a pump jack, a base, a Samson post pivoted on the base, a beamfulcrumed on the xpost, a three element toggle lever and pitman bracingand actuating connection .be tween the base, post andlever, two of whichelements are normally alined and extend across the angle between thebase and post, and means movable in a horizontal plane for moving saidnormally alined elements into and out of alinement.

2. In a pump jack of the character described, a horizontal base, aSamson post pivoted on the base, a beam fulcrumed on the post, a togglejoint connected with the base and post, a pitman connecting the togglejoint with the beam, and a reciprocating element ivoted to the togglejoint and extending orizontally from t-he'toggle joint. i 3. In a pumpjack of the character described, a horizontal base, a post hinged to thebase, a beam fulcrumed on the post, an inclined brace including aknuckle joint and extending across the angle between the base and thepost, a pitman extending from the brace to the beam, said brace normallysupporting the post in an upright position and the beam in a horizontalposition, and rectilinearly movable means for displacing the brace atthe knuckle joint to tilt the post and swing the beam.

4. In a pump jack of the character described a base, a post hinged tothe base, a bea iulcrumed on the post, an inclined lol-abbY including aknuckle joint and extending from the base to the post, a pitmanextending from the brace to the beam, said brace normally supporting thepost in an upright position and the beam in a horizontal position, and areciprocatory horizontal link pivoted to thev brace for swinging thevsame to tilt the post and swing the beam.

'5. In a pump jack of the character described, a horizontal base, aSamson post lower end to the knuckle joint and fulcrumed at its upperend to the beam, said upper and lower links normally being alined andconstituting a brace for the post.

6; In a pump jack, a base, a Samson post pivoted on the base, a beamfulcrumed on the post, a pair' of normally alined links of substantiallyequal length extending across the angle between the base and post andpivotally connected at their inner ends to each other and at their outerends to the base and post respectively, a pitman pivoted at its upperend to the beam and at its lower end to the links, and an actuating linkarranged to reciprocate in a horizontal plane 'and pivotally coupled tosaid links and pitman.

7. In a pump jack of the character described, a base, a Samson postpivoted on the base, a beam ulcrumed on the post, a pitman dependingfrom the beam an upper link inclined downwardly from the post, a lowerlink extending upwardly from the base, said upper and lower linksextending across the angle between the base and the post and beingnormally alined and forming a brace for the post, an actuating link, allof said links and the pitman having a common point of connection, and aking bolt passing through said parts at the common point of connectionand forming therewith a toggle joint.

8. In a pump jack of the character described, a horizontal base, aSamson post pivoted on the rear portion of the base, a horizontal beamhaving its rear end pivoted on the post, means at the front end of thebeam for connecting with and supporting a polish rod, an inclined togglelink pivoted at its lower end to the forward portion of the base, asecond toggle link pivoted at its upper end to the post, a king boltconnecting the ends of the toggle links, an actuating link having oneend pivoted on the bolt, and a pitman having' its lower end pivoted onthe bolt and having pivotal connection at its upper end with the beam.

9. In a pump jack of the character described, a horizontal base, aSamson post pivoted on the rear portion of the base, a horizontal beamhaving its rear end pivoted on the post, means at the front end of thebeam for connecting with and supporting a polish rod, an inclined togglelink pivoted at its lower end to the forward portion of the base, asecond toggle link pivoted at its upper end to the post, a king boltconnecting the ends of the toggle links, an actuating link having oneend pivoted on the bolt, and a pitman having its lower end pivoted onthe bolt and having pivotal connection at its upper end with the beam ata point adjacent the fulcrnm point of the beam.

10. In a pump jack of the character described, a horizontalbase formedof longitudinal members, a vertical Samson post having an ear at itslower end pivoted between the members ofthe base, said post being formedof spaced nprights, a lower inclined link having its lower end pivotedbetween the members of the base, an upper inclined link having its upperend pivoted be.

tween Athe uprights of the post, a transverse king bolt on which theinclined links are pivoted, an actuating link having one end pivoted onthe bolt, a horizontal beam, a pivotal connection between the upper endof the post and the rear portion of the mem- FRANK GARDNER.

